If the screen is blank on the Nymi Band and pressing any button does not wake it up, charge the Nymi Band.
If the charging symbol appears, then charge the Nymi Band for at least 2 hours. If the charging symbol does not appear, restart the Nymi Band. If the startup sequence and charging symbol does not appear, replace the Nymi Band with a new one. See Issuing a temporary Nymi Band to a user in the Nymi Enterprise Edition Administration Guide for information about how to deactivate the existing Nymi Band for a user, and then assigning a new Nymi Band to the user.